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mode or with low-impedance loudspeakers. Connect
the loudspeakers with heavy-duty (16-gauge or thick-
er) stranded wire.
Connections may be made in either of two ways.
[See Figure 2.]
(1) Strip off a half-inch (1 cm) of insulation from
each speaker wire. In each conductor, twist the thin
strands of wire together. Unscrew the knob, insert
the bare wire into the opening at the base of the bind-
ing post, and tighten the knob until it grasps the wire
securely. Check to be sure that no loose strand of
wire is touching the chassis or an adjacent terminal.
(2) Install banana plugs on your speaker wires,
and plug them into the end of each binding post. The
terminals are separated by 3/4 inch (19mm), so they
will accept dual-banana plugs.
Connect the wires from the left-channel speaker to
the CH 1 + and CH 1 - terminals and the wires from
the right-channel speaker to the CH 2 + and CH 2 -
terminals.
NOTE — Stereo speakers must operate in phase
with each other in order to produce a focused stereo
image and to reinforce rather than cancel each
other’s output at low frequencies. When connecting
speakers, take care that the red (positive) terminal on
each loudspeaker is connected to the corresponding
red (positive) terminal on the amplifier.
6. BRIDGING
The two amplifiers within the Model 912 can be
“bridged” to form a single amplifier of about three
times the power per channel.
To convert to bridged operation:
(1) Switch the POWER off.
(2) Disconnect any input and output cables.
(3) Set the bridging switch to ON.
(4) Select the cable from the speaker that is to be
driven by the 912. Connect its “positive” conductor to
the CH 1 + terminal and its “negative” conductor to
the CH 2 + terminal (i.e. to the two red terminals). DO
NOT connect any wires to the black terminals (CH 1 -
and CH 2 -).
CAUTION: In the bridged mode, wires must be
connected directly from the amplifier to the speakers,
not to a speaker switch, headphone adapter, or any
other device that shares a common ground between
channels.
(5) Connect the signal lead from the source chosen
to be amplified by the bridging amplifier to the input
socket of the CH 1 amplifier.
(6) Turn the POWER on.
NOTE — If you are using two pairs of speakers on
one channel, or if you are in the bridged mode, we
recommend that the speakers have a nominal imped-
ance of 8 or more.
7. SOFT CLIPPING
When an amplifier is driven beyond its specified
power output it normally produces “hard clipping” of
the signal with harsh distortion and power-supply
buzz as the output transistors saturate. The NAD
SOFT CLIPPING circuit gently limits the output wave-
form and minimizes audible distortion when the
amplifier is overdriven. We recommend that it be
switched ON when playing music at levels that might
exceed the amplifier’s power capacity.
FRONT PANEL
1. POWER
Press this button to switch the amplifier on or off. A
green LED above the power button illuminates when
the power is on.